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Matter in Our Surroundings — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceMatter in Our Surroundings3 Marks
Question
Explain why, ice at 0°C is more effective in cooling than water at the same temperature.
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Answer

This is due to the fact that for melting, each kilogram of ice takes its latent heat of 3.34 × 105 joules from the substance and hence cools the substance more effectively. On the other hand, water at 0° cannot take any such latent heat from the substance.

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